DDP3310B datasheet(18/60 Pages) MICRONAS

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DDP 3310B

ADVANCE INFORMATION

Micronas

2.3.4. Horizontal Phase Adjustment

This section describes a simple way to get a correct

horizontal frame position and clamp window for analog

RGB insertion.

1. For a correct scaler function in panorama/water-

glass mode, the digital input data should be cen-

tered to the active video input signal.

2. The clamping pulse for analog RGB insertion can be

adjusted to the pedestal of the input signal with

POFS2.

3. The horizontal raster position of the analog inserted

RGB1/2 signal can be set to the desired frame posi-

tion with POFS3.

4. The horizontal position of the digital RGB signal can

be shifted to the left and right with NEWLIN. Follow-

ing values allowed in respect to POFS2:

− 90 < (POFS2+NEWLIN) − (Clk×SFIF) < 580

− Clk = 3 @ LLC2 = 27 MHz

− Clk = 2.5 @ LLC2 = 32 MHz

5. Now the positioning of horizontal blanking and the

picture frame generator can be done.

2.3.5. Vertical Synchronization

The number of lines per field can be adjusted by soft-

ware (LPFD). This number is used to calculate the ver-

tical raster. The DDP synchronizes only to a vertical

sync within a programmable detection window (LPFD

± VSYNCWIN). If there is no vsync, the DDP runs with

maximum allowed lines and if the vertical frequency is

to high, it runs with minimum allowed lines. The

smaller the detection window, the slower the DDP gets

synchronized to the incoming vertical sync. In case of

an interlaced input signal, it is possible to display both

fields at the same raster position by setting R_MODE

to 1 or 2.

An automatic field length adaptation can be selected

(VA_MODE). In this case, the vertical raster will be cal-

culated according to the counted number of lines per

field instead from LPFD. This is useful for video

recorder search mode when the number of lines per

field does not comply with the standard, or if you want

to use a common value of LPFD for PAL and NTSC

(e.g.: LPFD = 290; VSYNCWIN = 54).

2.3.6. Vertical and East/West Deflection

The calculations of the Vertical deflection and East/

West correction waveforms are done in the internal

processor. They are described as polynomials in x,

where x varies from

−0.5×zoom to +0.5×zoom for one

field. For zoom>1 the range is limited between

−0.5

and +0.5.

The vertical deflection waveform is calculated as fol-

lows (without EHT compensation):

– VPOS

defines the vertical raster position

– AMPL

is the vertical raster amplitude (zoom

≥1)

– LIN

is the linearity coefficient

– SCORR

is the coefficient for S-correction

The vertical sawtooth signal will be generated from a

differential current D/A converter and can drive a DC

coupled power stage. In order to get a faster vertical

retrace timing, the output current of the vertical D/A-

converter can be increased during the retrace for a

programmable number of lines (FLYBL). The range

between the end of the flyback and the beginning of

the raster is also programmable (HOLDL).

The East/West deflection waveform, generated from a

single-ended D/A converter, is given with the equation:

– WIDTH

is a DC value for the picture width

– TCORR

is the trapezoidal correction

– CUSH

is the pincushion correction

– CRNU

is the upper corner correction

– CRNL

is the lower corner correction

Fig. 2–15: Vertical and East/West deflection waveforms

Vvpos

ampl

(

lin x

scorr x

3 )

⋅

⁄

width

tcorr x

cush x

corner x

⋅

-0.5

-0.3

-0.1

0.1

0.3

0.5

-0.5

-0.3

-0.1

0.1

0.3

0.5

DDP3310B Datasheet(PDF) 18 Page - Micronas

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